Wedge actuated quick acting nut



April23, 1957 M. SKEISVOLL. I $789,458

WEDGE ACTUATED QUICK ACTING NUT Filed April 19, 1954 WAA A I NagneS/reisrbl/ 22 INVENTOR.

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United States Patent WEDGE ACTUATED QUICK ACTING NUT Mague Skeisvoll,Hudson Heights, N. J.

Application April 19, 1954, Serial No. 424,636

1 Claim. (CI. 85-33) This is a continuation in part of my application,Serial No. 290,429, filed May 28, 1952, and now abandoned, and relatesto improvements in quick acting nuts and specifically it refers to a nutof a novel design for use with drilling machines and the like wherequick changes are necessary.

The main object of my invention is to furnish a quick acting nut ofsimple construction, which will securely fasten an article and whichwill make it possible to quickly unfasten same.

Another object of my invention is to provide a quick acting nut whichmay be used as a lock nut in adjusting a stop limiting the travel of amachine, such as a drilling machine or a hand screw machine.

Other objects and advantages of this invention will be apparent duringthe course of the following description and claim.

In the accompanying drawings, forming a part of this application, and inwhich like numerals designate like parts throughout the same,

Figure 1 is a side elevation of a quick acting nut in the open positionembodying my invention,

Figure 2 is a section through the nut in Figure 1 and also it shows samein the open position,

Figure 3 represents a side elevation of the same nut in the closedposition,

Figure 4 is a section through the same nut in its closed position,

Figures 5 and 6 represent side elevations of the inner part of a nut, inFigure 5 the nut is shown in the open position and in Figure 6 in aclosed position, and,

Figure 7 is an elevation taken along line 7--7 in Figure 6.

In the drawing, wherein for the purpose of illustration, there is showna preferred improvement of my invention, numeral 10 designates a bolt orthreaded rod upon which the threaded nut 11 is free to run. The innernut 11 has an internal thread 12 at one end, see Figure 2, and it hasfurthermore an enlarged plane surface 13 at one end with a knurledportion 14 which may be gripped when operating the nut. Nut 11 also hasa conical shoulder 15, see Figures 2 and 5, and a neck 16 which carriesan external thread 17 at the other end. A wire spring 18 fitting in agroove in the end of nut 11 holds the same in the open position as shownin Figure 5.

The nut 11 consists of 2 halves which, as mentioned supra, are heldtogether by the spring 18. When the outer nut 19 is removed, the entirenut will take the open position as shown in Figure 5. The 2 halves rockover the point 22 which becomes a fulcrum around which the 2 parts move.This fulcrum is made in a form of a raised wedge shaped member on onehalf fitting into a corresponding groove on the other half.

The outer nut 19 having an internal thread 20 fitting the externalthread 17 of the inner nut 11 is placed over said inner nut from oneend. The out 19 has a conical shoulder 21, see Figures 2 and 4, whichfits over shoulder of the inner nut 11. The shoulder 21 of nut 19 is infrictional engagement with shoulder 15 of the inner nut.

To avoid freezing of nut 19, I find it desirable to make the end of samewith shoulder 21 from a different mate rial, such as brass, or othersuitable material having the desired friction characteristics.

The nut 19 also has a knurled portion 23 which is useful when tighteningthe nut hard. The nut 19 is otherwise made of one piece except for theshoulder 21 as mentioned above and it may be made from steel or anyother suitable material.

The operation of my invention is as follows: The outer nut 19 is placedover the end of the inner nut 11 until the thread 20 of nut 19 engagesthe thread 17 of nut 11. The outer nut 19 is then turned on to thread 17until the shoulder 21 meets shoulder 15. In this position the assemblednut is in the open position as shown in Figures 1, 2 and 5. When it isdesired to close the nut, it is only necessary to grip the knurledportion 14 of the inner nut with one hand and the kurled portion 23 ofthe outer nut with the other hand and turning both nuts in an oppositedirection until shoulder 21 enters over shoulder 15 of the inner nut. Inso doing the conical surface of the shoulder 21 will slide over shoulder15 of the inner nut and will force same together by turning on fulcrum22 and by simultaneously stretching spring 18. As the nut 19 is turnedfarther over threads 17 the shoulder- 21 will force the threaded portionof the inner nut 11 together until the threads 12 of same engage thescrew threads of the bolt 10. The nut may now be used as an ordinary nutor as a lock nut for various purposes as mentioned above. This nut hasthe advantage of being capable of locking itself without a second nut,just by turning the outer nut 19 until the 2 halves of the inner nut 11are pressed tightly against the screw threads of the threaded rod 10.When it is desired to move the nut, it is only necessary to unscrew theouter nut 19 whereupon the 2 halves of the inner nut 11 will turn onfulcrum 22 'by the force of the spring 18 and will open and disengagefrom the thread of the bolt 16. The not may then be quickly moved bysliding up or down the rod 10.

It is to be understood that a form of my invention, herewith shown anddescribed, is to be taken as a preferred example of same, and thatvarious changes in shape, size and arrangement of parts may be resortedto without departing from the spirit of my invention, or the scope ofthe sub-joined claim.

Having thus described my invention, I claim:

A quick acting nut comprising an inner nut having two equal halves splitalong the longitudinal axis, said nut having an internal thread at oneend and having a fulcrum between said two halves, near the middle, saidhalves furthermore having an outer knurled portion followed by a conicalshoulder followed by a neck extending to a threaded portion having anexternal thread past said fulcrum, said halves also having an externalannular groove at the opposite end from said internal threaded portion;a circular wire spring placed in said annular groove, said springholding said halves together 'by a contracting force; a second outer nuthaving an internal thread fitting over said external thread of saidinner nut, and an annular ring of different material such as brasspressed into one end of said second nut, said annular ring having aconcave conical shoulder fitting over said conical shoulder of saidinner nut.

References Cited in the file of this patent UNITED STATES PATENTS351,474 Stevens et a1 Oct. 26, 1886 642,170 Starrett Jan. 30, 19001,376,296 Snow Apr. 26, 1921 1,652,169 Fleming Dec. 13, 1927 2,388,179Prowd Oct. 30, 1945

